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posted by  Wess on 9/4/2008 4:06:33 PM  |  status: Live  

life saver pts

Course Textbook Chapter Problem
N/A elements of modern alg 1.5 4
Question Details:
Let f: A→ A, where A is nonempty. Prove that f has a left inverse if and only if
 ( f(S) ) = S for every subset S of A.
Wess
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